[1/4] A road sign is seen next to a country highway on agricultural land amid flooding from the Salinas River, in Salinas, California, U.S., January 13, 2023.
The latest storm, the season's eighth, is expected to begin dumping heavy rain on California from early on Saturday, the National Weather Service's Weather Prediction Center said.
The ninth and final atmospheric river of the series is due to make landfall on Monday and last a couple of days.
Among the waterways of concern, the Salinas River in northern California flooded roads and farmland on Friday, when 24,000 people were urged to evacuate.
In southern California, officials will release water on Saturday from Lake Cachuma, which provides drinking water near Santa Barbara, as the chronically low lake has filled to capacity.